wlan shows no connections available

hello ,

i am using alienware m14x r1 , recently i have clean installed my win 7 , after that i have issues with the wireless lan , i have updated drivers , unsistalled and indtalled them again , enabled it in bios, updated bios as well as latest drivers for all the devices...but no help , but the ethernet is working fine...when i ran troubleshoot it says there is problem with drivers i unistalled and installed latest drivers from intel still no help..so friend of mine suggested getting new wlan card , changed the card too still no help...